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公开(公告)号：US3069581A
公开(公告)日：1962-12-18
申请号：US8822861
申请日：1961-02-09
Applicant: GEN ELECTRIC
Inventor： ENGENE LEMMERS
IPC: H01J61/04 , H01J61/067
CPC classification number: H01J61/04 , H01J61/0672
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